Improper Authentication in Casso Flow Plugin for WordPress
CVE-2026-103382
Key Information:
- Vendor
WordPress
- Status
- Vendor
- CVE Published:
- 28 October 2026
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What is CVE-2026-103382?
The Casso Flow plugin for WordPress, prior to version 4.2.0, contains a flaw in the authentication of incoming bank-transfer payment notifications. This vulnerability arises from the fact that the token utilized for verification is left empty in default installations. As a result, unauthenticated attackers can exploit this vulnerability to forge notifications, leading to the unauthorized marking of any pending WooCommerce order as paid, independent of its actual payment method. This poses a significant risk to the integrity and security of financial transactions conducted via WooCommerce.
Affected Version(s)
Casso Flow 0 < 4.2.0
Exploit Proof of Concept (PoC)
PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.